WARNING: Lexing literal_block ... as "scss" resulted in an error at token: '$'

[stevepiercy]

The following SCSS code block gets incorrectly marked as invalid in docs/theming/theme_barceloneta.md.

$border-radius:               1rem;
.searchButton.btn.btn-secondary {
    border-radius: 0 $border-radius $border-radius 0;
}

Pygments demo

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Reported in pygments/pygments#2818